Magnetic separator for threshing-machines



n (NoModel.)

E. H. OSBORN. MAGNPTIG SBPARATOR FOR THRBSHING MACHINES.

No. 570,496. Patented Nov. 3, 1896.

UNITED STATES PATENT OFFICE.

ELISHA Il. OSBORN, OF DES MOINES, IOVA.

MAGNETIC SEPARATOR FOR THRESHlNG-IVIACHINES.

SPECIFICATION forming part of Letters Patent No. 570,496, dated Noyember3, 1896.

Application filed January 24, 1896. Serial No. 576,747. (No model.)

To all whom it may concern.-

Beit known that I, ELIsHA H. OsBoRN,a citizen of the United States ofAmerica, and a resident of Des Moines, in the county of Polk and Stateof Iowa, have invented a new and useful Improvement in MagneticSeparators for 'lhreshing-Machines, of which the following is aspecification.

Heretofore much trouble has been experienced by threshermen owing to thefrequency with which the teeth of the cylinder or concave of themachineare broken by reason of the clicking of the cylinder by excessivefeeding or the presence of pieces of metal or rock or wood in thebundles of grain. Vhen one tooth is broken from either the cylinder orconcave, it naturally passes through the machine, is conveyed by theelevator to the tail spout or shoe, from which the tailings aredelivered to the cylinder for rethreshing, and falls into and passesthrough the machine again and again, causing material and expensivedamage by destroying additional teeth. This trouble is experienced tothe greatest degree in machines Whichemploy automatic or self-feedingapparatus, since under such circumstances no attendant is adjacent tothe shoe to remove the teeth as they appear and prevent them fromrentering the machine.

It is the object of this invention to provide means for automaticallyremoving broken teeth or other metallic objects from the tailings assaid tailings reenter the machine and prevent said teeth from continuingtheir damaging course.

My invention consists in locating a magnet in the path of travel of thetailings, which magnet is of such character as to attract and retain thebroken teeth, and also in the provision of an alarm indicating thepresence of a tooth on the'magnets.

My invent-ion consists, further, in locating in the path of travel ofthe tailings from the machine to the cylinder a series of metallic barsarranged in close juxtaposition to each other and connected with analarm indicating the presence of a tooth or other foreign metallic bodyin contact with the said bars.

My invention consists, further, in the construction, arrangement, andcombination of parts hereinafter set forth, pointed out in my claims,and illustrated by the accompanying drawings, in which- Figure l is aside elevation of a portion of a threshinginachine, showing my inventionapplied thereto. Fig. 2 is a sectional elevation longitudinally of thedelivery spout or shoe, showing my invention applied thereto. Fig. 3 isa plan of the delivery spout or shoe to which my invention is applied.Fig. 4 is a plan of a delivery spout or shoe to which a modified form ofmy invention is applied.

In the construction of the machine as shown the numeral l0 designates adelivery spout or shoe which is suspended in a common inanner above andadjacent to the entrance to the breast of a threshingmachine, and adelivering-elevator l-l of common form discharges the tailings of themachine into the outer end portion of the said shoe. The shoe may be ofany ordinary construction, preferably with an open top, and may beprovided with any ordinary means of screening the tailings anddischarging said tailings.

The side boards of the shoe l0 are apertured in series in inclinedplanes, and a series of bars or magnets, as they hereinafter will betermed, l2 are mounted in the said apertures at slight distances ofseparation from each other and provide a slotted way or screen toreceive the tailings from the elevator ll. The magnets 12 are of thecharacter designated as permanent magnets and are of such size andstrength of magnetism as will attract and retain broken teeth or othersmall metallic objects when brought in close relation therewith. Themagnet nearest the outer end oi' the shoe is connected to a circuit-wirel3,which circuit-wire leads therefrom through a bell 14, mounted on theelevator l1, and through a battery l5, also mounted on said elevator.The circuit-wire leads from the battery l5 to the magnet adjacent to theone nearest the end of the shoe, and the remaining magnets are in likemanner alternately connected to the circuit-wires. By this constructionan electric circuit is not complete until two adjacent magnets areelectrically connected, as, for instance, by a tooth lying upon andengaging both of said magnets.

In the form of device shown in Fig. et the magnets are of horseshoeshape and overlap IOO each other in pairs, one magnet of each pair beingconnected to the opposite end portions of the circuit-wire 13. Thehorseshoe-mag nets are positioned in different horizontal planes inorder that they may overlap without such contact as will establish acircuit un der normal conditions.

ln the practical use of this device when a tooth is deposited in theshoe from the elevator it immediately is attracted to and contacts withone or two or more of the magnets and is retained by said magnets andprevented from rentering the machine. Then a tooth engages two or moreof the magnets simultaneously, a circuit is established through thebattery and bells and the bells are run g, thus sounding an alarm andindicating the presence of a tooth in the shoe. Upon hearing the 'alarman attendant may remove the tooth from the magnets and thereby avoid thepossibility of its accidental release or the running down of thebattery.

I claim'as my inventionl. In a threshing-machine, a series of metallicbars located in the path of travel of the tailings from the machine tothe cylinder and forming abottom over which the tailings must pass tothe cylinder, and an electric bell-circuit connected with said metallicbars, which bell-circuit is normally open and is closed by the contactwith said bars of a foreign metallic body.

In a threshing-machine, a magnet located in the path of travel of thetailings from the machine to the cylinder and a bell-circuitelectrically connected with said magnet and operated by the contact of ametallic body with said magnet.

3. ln a threshing-machine, a shoe through which the tailings pass vfromthe machine to the cylinder, a series of metallic bars arranged injuxtaposition to each other within said shoe and forming a bottom overwhich the tailings must travel to the cylinder, and an alarm connectedwith said bars and so arranged relative thereto as that said alarm willbe sounded when a metallic body engages two or more of said bars.

et. In a threshing-machine, a shoe through which the tailings pass fromthe machine to the cylinder, aseries of metallic bars arrangedtransversely of the shoe parallel with and in juxtaposition to eachother and forming a bottom over which the tailings must pass to thecylinder, an electric alarm-circuit, connections between one line ofsaid circuit and alternate individuals of the series of bars, andconnections between the remaining line oi' the alarm-circuit and theremainder ot the series of bars.

ELIS'IIA Il. OSBORN.

Witnesses:

S. C. SWEET, G. M. MELICK.

